Both the Yonhap and Chosun news agencies of Korea are reporting that Samsung Mobile President JK Shin has confirmed 20 million Galaxy S4 handsets have been sold since the phone launched around the end of April. The Verge has a handy graphic below comparing sales of the Galaxy S4, S III, and S II against the iPhone 4S and iPhone 5 from their respective launch dates. As you can see, if the 20 million figure is correct, Samsung is quickly closing in on Apple's "single model sales" crown.